Punch



April 18, 1933. P, PETER N 1,904,951

PUNCH Filed March 21, 1930 Qatar peter/i972 Patented 1 8, 1 933 i PETERrn'innscm or DEQR I imIcnI An-Q f] i Q i invention has for its tbj ectto prbvide a p nch which is SO censt'ructed thet itma be readily removedfrom the retainer in a die head. The invention particularly relates to V"6 small punches that are reindvably connected to a head-by a balllatchlocatedinblocks or sucketsin which the punches are steppedij-A'sis; Well known in cennecticn with Such case; e large number of punchesfor punch a. plurality of holes in sheet materiel in a single stroke ofthe 1 press, it is) difficult to remove "One-0r more 'cfthe pun g thefact-that the stripper plate interferes. with. the engagement Of thepunchiend pre- Vents Withdretjvtr'albffthe punch from its Socket. Thisis partimnefl 'true inwiewof the fact that the punches eftenbrea-k ofl,dnlyleaving thel'sha'nkegto gri Ith'a's been customary to provide en 'oenmg for the 'inisertion f d'wire thrmigh thestrippe'r plate andancpeni'ng in the socket t6 displace the ball from it's latch eng ement,with the that the punches tightly f'fit the ockete, it "is difiicult toremove the punch from the secket even Whenthe ball is pushed out cfeiigagemeet. Disn1antling Of the=strippeif plate fr'cni the'pres'serhead" is invariablyrequlre'd. By my invention,'n1eans is providedwhereby the punch may be'f orcib'ly removed from the socket, thoughitm'ay tightlyfit therein; Theinvention may be applied to"p ujnche s (ifdifierent forms ancLto illustrate apractical application of .the'invention, 1 have selected two or three forms (if punches; em bodying'the invention and thepunch removing tool to illustrate practicalapplicaticns of the invention.- The punches and the punch rei'nevingtocl are" described. hereinafter: *7 [Fig 1 illustrates a fragmentaryView of the punch die head and str'ipper plate and a punch fremcying"tccl. located in position. Fig.2 is'en enlarged view "of the punchmuetrzited in Fig. 1. Bis-enmdtiefii 0f 'puDcheSQ herethere are as isccmmcnly'the- Shank ef {the unch, but owing t6 the fact the punches havebeen withdrawn from; the

se'ctien taken -on the plane of [the line indicated'in' Fig. Fig. 5 ishiside viewer the punch illutrate'd Figfi. ,Fig. eis' an J end iew of-athird; term of unehs Figfl View of a-se'ctien taken (in-the hine-(if theline 7- 7 indicated in Fig. 6. ig; s is a side view of ztpiihch showniii Fig. 6. l V As'is 'wellkiiown in connection with p nch;

'lccate' and secure the sg' cket propei esition with reference t6 theother 'puil'che' that its may be col'mectedltii the'head 4." A stripperplate 5 is commdnlys uppcifted hyineaii's 0f the pins 6 which ere'slidable ihi the heed 4; and are spring pressed,- eeby the- Spi"ings 7.Th stripper 'plate 5" opef tee-tegengege the "m Sheetmeter to be,p-u'n'ehed and secure it in pqsition during the puncturingoperetion'efid uiitil the puncheeleeve the'sheet'jfltii-l thet isepereted upon; The spi 'ifigs7 epera';te to hold the stripper plate *5"dewn' until after ,Thepunch 1 is held inpositien byineefi's' of theball 10 that is locatedin a. hole c'cjn taining' it s ring14' vhichoperate tqipuj h the ball 10 towards thelow'er end Ofthe'heIe 11; "Thehole 11 is bered at an n le te the hole 12 thatfermsthe socket of 'thepunch 1, and sc as'to form an openin het'w'ee'nlthe 'holee 11 and 12forth'e'bell 10 t6 engage the shank of the punch-1E "The opening is, how

' ever, suflieiently em ui tc prevent theifes'cape of the bells sideo'fthepunc'hi is reiii)v adapted to engage the ball '10, and by reason'wardly and-away and, consequently, A v

greater depth of the concavity13, also preof the pressure of the spring1 1 to resist rota. tion of thepunch 1. The line of the convex I surfacelocated in the plane extending through the axis of the punch, slopes upfrom the axis of'the punch; the ball-10, which seeks the vents theremoval of the punch lthat may be,

caused by the frictional engagement of the j punch inthe sheet metalthat is being oper:

e' v aliofthepres 5.

. engagement 2O movementspf the-jfpunch lain withdrawing.

upon by the] punch during the with- 'The'spring pressureagainst I sists"such turning movement of the punch 1," and, inasmuch'as' it isnecessary that the-shankofthe punch lshould fit quite closely the 'thas-been found that the frictionalsocket 2, a

between the socket and-the shank of the punch. 1 also I preventslongitudinal thej -punch' from the} SOCkGlJ-i This. is .particular-lytrue-.whereJ the punch is broken off.

Also, -?owing to the close proximity-of the account.

stripperi' plate ";t0 lthe presser-head, and on. of, the. size or areaof the stripper" plate, and in view of thesfact that, as rule, a a genumr suchzpu h s a i i butedover the area'gof the stripper plate, it

' is practically.impossiblefto remove any of the p n .W ent ey'h veb okn- Tounlockth ball'latch,ia wire is inserted in aligned openings,'suchiasthe. opening formed in the, stripperiplate 5, and the opening 16formed in the block or soeketi2. The.

. 'openin g16;extends to the hole 11 in :which thballlO i located. The tn is lifted from the engagementwithithe punch; by thewire and ,whenanefiort :has been made to; engage the punch with; pinchers, at a pointbetween the socket '2' andithe stripper plate 5, such effortshaveusually; been unsuccessful. and, r

' I y y i nth punch s ,areprovided '0 with a'rounde -5 I I throughthe 75'5 nates all suddenchanges spending in shape andsizeto the male that Iis formed-on the punch, is used. The. ex-

owing, to the large number of 'punches and the --difliculty experiencedin reaching the pu es, it'h iynvar b y; be .f und1 e ssary toremove the.stripper plate fro'm the whichwwould otherwise occur in the corners.

This is offparticular value where the punches are smalL]; For theremoval :offthepunches, a toollfi'having a'female thread'19, correteriordiameter. of'the' portionoffthe tool is slightly, less than the diameterof theopening '20. inithe stripp pla ;5 t 1 gh W h l ui gmove in re inahe "W k:

tosecurely connect .1, whereupon the dra-wn froni the-socket-2. The

sag the'pu fch d'rsmot h 1 1 d ate i Fi i .Iclaimtf 1 Whereby, the endof thetool 17 may a readily inserted through. the stripperplate and re.-1 tated to engage the thread 18 of the punch). Preferably, the tool isprovided with ahandle the tool 17 with thepunch,

22, whereby it may be, not only readily turned but also to draw'thepunch from the die head.

Theconcavit-y 13 is alsopreferablyso formed. f that the punches may beturned by the tool, by a pressure exerted on the handle,.to forcetheball; 10 upwards in the" openinglras the.

concave recess -13 is movedt awayfrom- 'the ball-10 and until the ball1Q1ri O t cylind rical surface of theshank of the punch punch fl may beforcibly surfaces 9 of the concavity preferablyslopefrom the center itofthe concavity.

considerable-torque,todisengage the ball and tight; of thepunch-{in:its- -.soclet.i Thus, any one of Where the'fl punche 's havean s i nrsuc as th ts o n n igs- 3,.and

The handle 22 afiords a 1. neansiforgripping the tool to rotate, with VWi w: th p n h,;-l o wit istmiding:.:fi H

a l rge n mb rl pun he maybe readily removed. from .the .diefhea'dwithout m v lo he r pper'pla e; l 1: b ongro AL, the thread-maybe formedonly on the porf Q tions'of the surfacesthat areglo catedat dis greaterthan the otherportionsbf the s 'facesgsuch as,- thethread mayjbeformed:Q P r ions 2. ofr h p eh fia-si esus I? the. axis ,of

P r QnsL p o e. f the the Punch-than th PQrtiQD ct en l e y: b aPP i p nsuchgas t ow il F gs: 6, in which-case the 1 th The. @01 square es eeme1 above the square.end:;-3O of -the {punch and in med a t s ank 'andtheiqu .eiid- --The-,too117;may be providedwith the female thread thatcorresponds to thegfemalethread in man- In combinat on withand; astrippplate, the-stripperplateconnectedto there n amfih S pper p tsher a r iae punch'having a shank atone end and a shear for short limited movements relative tof the a- 9 and the-tool ma be ins'erce d a'ted toien- 1 41i .ing edge ati'the.v other end, ,the unch located I in. protei s h hwhp n l he rain having a .socket, aball latch locatedin 129 the ramforsecuring the punch in the T socket of the ram,the shank ime punchhavingja sloping concave surfaceloperable; by rotative movement ofthepunch toforcethe ballaway from the axis of. thepunch to release thepunch from the ,ball latch, a-spring for press; ing the ball against thesurfaceof thepun j; at apoint located at theffbottom of, mason-j cavity;thejpunch-having'faspiral c rrugati n" lo at iq tHs ank and e -we n ssnormally above the lower surface of the stripper plate and adapted toreceive a tool 7 having a spiral corrugated surface fitting thecorrugated surface of the punch'and insertable through the said openingand adapted to engage the punch 'by rotation and rotate the punch todisen age it from the ram and withdraw the punc through the opening ofthe plate.

In Witness whereof- I have hereunto signed my name tothis'specification.

PETER PETERSON.

